(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one 、 trans-2-(4-Chloro-2-fluorophenyl)cyclopropane-1-carboxylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 253 (40 mg, 47.4% yield) as a white solid的产率得到(3S,6S)-4-[(1R,2R)-2-(4-chloro-2-fluoro-phenyl)-cyclopropanecarbonyl]-6-cyclopentyl-3-isobutyl-piperazin-2-one